Problem with auto loader (Blank line and distort character)

I add a new class and put it in the auto_loaders with name config.xxx.php. It did initialize but when access by IE, all pages show with a blank line at the top and all characters distorted with size nearly doubled.
I have been trying the whole morning without success and cannot find an answer in this forum.
Please help!

Gamma:

... when access by IE, all pages show with a blank line at the top and all characters distorted with size nearly doubled.That's a classic symptom of extra code showing in browser source before regular page content.
If you click View Source, you'll likely see extra spaces or characters above the normal HTML content ... and those are likely located in your custom-added files ... perhaps you have left extra characters in your new files? Or maybe you have some syntax errors?

If you remove your class file (and any other related files you've added as part of this class), does the problem disappear? If so, then you know where your problem resides.

DrByte:

If you remove your class file (and any other related files you've added as part of this class), does the problem disappear? If so, then you know where your problem resides.

I have cut the code to minimum:

In the config.xxx.php```php

In the class file:```php
<?php
if (!defined('IS_ADMIN_FLAG')) {
  die('Illegal Access');
}
class test extends base {
}
?>

It does not solve the problem.

If you delete those files from the server, what happens?

What is the URL where this can be seen?

DrByte:

If you delete those files from the server, what happens?

What is the URL where this can be seen?
DrByte. Thank you very much for your help!
After I deleted the files from the server, it returns to normal.

If I insert the following lines below breakpoint 180 of config.core.php,
it works fine.

$autoLoadConfig[190][] = array('autoType'=>'class',
'loadFile'=>'test.php');
$autoLoadConfig[200][] = array('autoType'=>'classInstantiate',
'className'=>'test',
'objectName'=>'zc_test');

So, if it works that way, then you had done something incorrect in your custom config.xxxxxx.php file ... perhaps extra blank lines at the end of the file?

DrByte:

So, if it works that way, then you had done something incorrect in your custom config.xxxxxx.php file ... perhaps extra blank lines at the end of the file?

There is no blank lines at the end of the file and no space after ?>.

Finally, the problem was solved by conversion of the config.xxx and class files from utf-8 to ANSI/ASCII. I don't know why it works. If someone know the reason, please tell.